CN108847885A - Illuminating light communication device, luminaire and lighting device - Google Patents

Abstract

The illuminating light communication device, luminaire and the lighting device that flash whens a kind of illuminating state inhibited in light source shifts etc. to modulating mode.A kind of illuminating light communication device is connect with the light source by issuing illumination light from constant current generating device circulating current, and is modulated to the illumination light of light source, which has：Switch is connected in series with light source；Signal generating circuit generates the signal of communication of the two-value switched on and off for control switch, to be modulated to illumination light；Current suppressing circuit is connected in series with light source and switch, and the electric current for flowing through light source is suppressed to and is no more than current setting value corresponding with a reference value；And control unit, the duty cycle of alternation switch can be carried out by signal of communication.Change the duty cycle of switch during the electric current that control unit circulates in current suppressing circuit changed transfer.

Description

Illuminating light communication device, luminaire and lighting device

Technical field

This disclosure relates to which a kind of carry out the illuminating light communication device of visible light communication by being modulated to illumination light, shine Funerary objects tool and lighting device.

Background technique

In the past, having light emitting diode (LED:Light Emitting Diode) as in the luminaire of light source, It proposes and is modulated by the intensity to illumination light to send the visible light communication of signal.In this illuminating light communication device Signal is sent by being modulated to illumination light itself, therefore does not need setting for the spy Do as infrared communications set It is standby.In addition, can be realized economize on electricity as illumination light source by using light emitting diode, therefore just in research and utilization to underground In pervasive (ubiquitous) information system in street etc..

Such as Japanese Unexamined Patent Publication 2015-19235 bulletin discloses a kind of visible light communication device, has control circuit, The control circuit is modulated the luminous intensity for the illumination light that the light source portion being made of light emitting diode is exported to be superimposed communication Signal.Record following content：In the visible light communication device, control circuit will be divided into multiple time slots the set time, week Repeat to phase property the transmission processing that signal of communication is exported in some optional time slot.Coming from multiple photographs as a result, The light of funerary objects tool can improve the probability of reception terminal terminating communications signal also with easy structure in the case where being overlapped mutually.

Summary of the invention

Problems to be solved by the invention

In the lighting device for carrying out visible light communication as documented by Japanese Unexamined Patent Publication 2015-19235 bulletin, From using DC current by the state of light source igniting be transferred in illumination light be superimposed signal of communication modulating mode when, sometimes by In the luminous intensity of illumination light instantaneous variation and cause human eye to feel flashing.

A kind of being designed to provide when the illuminating state for being able to suppress light source is shifted to modulating mode etc. for the disclosure occurs Illuminating light communication device, luminaire and the lighting device of flashing.

The solution to the problem

Illuminating light communication device involved in the disclosure with by issuing illumination light from constant current generating device circulating current Light source connection, and the illumination light of the light source is modulated, which has：Switch, with the light Source-series connection；Signal generating circuit generates the signal of communication for controlling the two-value of the switch switched on and off, with The illumination light is modulated；Current suppressing circuit is connected in series with the light source and the switch, will flow through the light The electric current in source, which is suppressed to, is no more than current setting value corresponding with a reference value；And control unit, it can believe by the communication Number change the duty cycle of the switch.Moreover, the electric current hair that the control unit circulates in the current suppressing circuit Change the duty cycle of the switch during the transfer for changing.

Luminaire involved in the disclosure has the illuminating light communication device and light source.In addition, involved by the disclosure And lighting device have the luminaire and constant current generating device.

The effect of invention

Illuminating light communication device, luminaire according to involved in the disclosure and lighting device, can be by light source Transfer of illuminating state when being shifted to modulating mode etc. during change the duty cycle of switch people inhibited to feel photograph The flashing of Mingguang City.

Detailed description of the invention

Figure 1A is the figure for indicating the structure of the lighting device for having illuminating light communication device as an embodiment.

Figure 1B is the figure for indicating to have the structure of lighting device of illuminating light communication device, which includes Transistor is set to be used for the dual-purpose control circuit of modulation movement and the inhibition of the electric current to circulate in light source the movement of illumination light.

Fig. 1 C is the figure for indicating truth table, the true value represent the signal generating circuit in Figure 1B signal of communication, The action state of two valves (valve) and transistor.

Fig. 2 is the figure for indicating not have the structure of the lighting device of illuminating light communication device.

Fig. 3 is the block diagram for indicating the structural example of control circuit and signal generating circuit in Figure 1A.

Fig. 4 is the flow chart for indicating the processing example of the control circuit in Figure 1A.

Fig. 5 is the explanatory diagram of the shift register in control circuit.

Fig. 6 is the flow chart for indicating the correction example of step S20 of Fig. 4.

Fig. 7 is the figure for illustrating the modulation system of signal of communication.

Fig. 8 is example (a)~(d) figure for indicating signal of communication.

Fig. 9 is the explanatory diagram for indicating the waveform of interrupted LED current.

Figure 10 is the figure for indicating current setting value corresponding with duty cycle.

Figure 11 A is to indicate to gradually change connection during the transfer set between direct current ignition mode and modulating mode The figure of the situation of duty ratio.

Figure 11 B is to indicate to gradually change during the transfer set between the first modulating mode and the second modulating mode The figure of the situation of duty cycle.

Figure 12 is the situation for indicating to gradually change duty cycle when lighting device starts during the transfer set Figure.

Figure 13 is to indicate to gradually change duty cycle during the transfer set when the driving of lighting device stops Situation figure.

Figure 14 A is turn for indicating to set between the luminous intensity of light source different the first dimming state and the second dimming state The figure of the situation of duty cycle is gradually changed during shifting.

Figure 14 B is the connection duty for indicating the first dimming state and the modulating mode in the second dimming state in Figure 14 A Than the figure of identical situation.

Specific embodiment

Explain embodiment involved in the disclosure in detail with reference to the accompanying drawings.In the present note, specific shape, Material, numerical value, direction etc. are the illustrations of for easy understanding disclosure, purposes, purpose, technical specification etc. can be cooperated appropriate Change.In addition, hereinafter, term " substantially " is for example used with the following meaning：Other than identical situation, also comprising real It is considered as identical situation on border.It is false from the beginning also, hereinafter, comprising multiple embodiments, variation etc. It is fixed to use these characteristics are appropriately combined.

Figure 1A is the structure for indicating the lighting device 10 for having illuminating light communication device 16 as an embodiment Figure.Lighting device 10 has constant current generating device 12 and luminaire 14.Luminaire 14 has 16 He of illuminating light communication device Light source 18.

Constant current generating device 12 has the function of making output constant current, convert comprising rectifier bridge 20, capacitor 22, DC-DC Device 24 and constant current feed circuit 26.Constant current feed circuit 26 has input resistance 28, amplifier 30, resistance 32, capacitor 34 And reference voltage source 35.

Source power supply (such as exchange 100V) is carried out full-wave rectification using rectifier bridge 20 and utilized by constant current generating device 12 Capacitor 22 carries out smoothly, being then transformed to desired DC voltage using DC-DC converter 24.In DC-DC converter 24 Output is connected with smoothing capacity device 25 between both ends.In addition, the series circuit of light source 18 and illuminating light communication device 16 and smooth electricity Container 25 is connected in parallel.Illuminating light communication device 16 have current suppressing circuit 17, break-and-make switch SW, signal generating circuit SG with And control unit 19.

Constant current generating device 12 has following function：Directly or indirectly detect in light source 18 electric current that circulates and by these Current value control is fixation.Detection resistance 27 and constant current feed circuit of the function based on the electric current for Direct-detection Optical source 18 26.In constant current feed circuit 26, reference voltage source 35 is connect with the positive input terminal of amplifier 30, input resistance 28 and amplification The negative input terminal of device 30 connects.In addition, in constant current feed circuit 26, in output terminal and the amplifier 30 of amplifier 30 The resistance 32 of gain adjustment and the capacitor 34 of phase compensation are connected in parallel between negative input terminal.

Constant current feed circuit 26 compares the pressure drop of detection resistance 27 and the voltage of reference voltage source 35 using amplifier 30 Between height and amplify the control unit that feedback after its difference arrives DC-DC converter 24.That is, being applied to DC-DC converter 24 Negative feedback control is added to make the pressure drop of detection resistance 27 consistent with said reference voltage.In addition, passing through the reverse phase in amplifier 30 The intrinsic standoff ratio of the resistance 32 and input resistance 28 that connect between input terminal and output terminal sets gain, in parallel with resistance 32 The capacitor 34 of setting is functioned as the integral element for phase compensation.

Smoothing capacity device 25 is connected between the output of constant current generating device 12, for the output to constant current generating device 12 It carries out smooth.

Comprising the multiple light emitting diodes being connected in series between the output of constant current generating device 12, constant current occurs light source 18 The output of device 12 is provided to the light source 18.In addition, the light-emitting component for constituting light source 18 is not limited to light emitting diode, it can also To be other light-emitting components (such as organic electroluminescent device, semiconductor Laser device etc.).

Break-and-make switch SW is additional to light source 18 in series, the electric current for making to be provided from constant current generating device 12 to light source 18 Discontinuously.Break-and-make switch SW is suitable with the switch in the disclosure.

Signal generating circuit SG generates the signal of communication for controlling the two-value of break-and-make switch SW switched on and off, with right Illumination light is modulated.Signal of communication is input into the control terminal of break-and-make switch SW switch on and off break-and-make switch SW. It is configured to receive the instruction from control unit 19 to change the connection duty by the break-and-make switch SW signal of communication generated Than.In addition, signal generating circuit SG, which both can be generated repeatedly, indicates to be stored in consolidating in control unit 19 such as merchandise news There is the signal of communication of ID, signal of communication can also be generated according to the transmission signal inputted from external device.

Then, illustrate the structural example of current suppressing circuit 17.

Current suppressing circuit 17 by with light source 18 and break-and-make switch SW it is concatenated in a manner of be additional to light source 18 and break-and-make switch SW, the size of the electric current for inhibiting to flow through light source 18.For example, current suppressing circuit 17 can also be with light source 18 and break-and-make switch SW is connected in series, and is set being suppressed to the electric current to circulate in light source 18 no more than electric current corresponding with a reference value according to a reference value Definite value.In such manner, it is possible to reduce the mistake generated in break-and-make switch SW from the electric current that disconnection becomes to circulate in connection Shun Inter light source 18 Punching, therefore can reduce the reception mistake in reception device.

Current suppressing circuit 17 includes as the transistor 36 of MOSFET, the resistance 38 connecting with source electrode, amplifier 40, base Quasi- source 42 and control circuit 44.

Positive input terminal outputting reference value of a reference source 42 to amplifier 40.A reference value provides the electric current to circulate in light source 18 The upper limit (current setting value).For example, a reference value is proportional to current setting value.In addition, a reference source 42 can also be according to signal The pattern of rows and columns (such as bit pattern) for the signal of communication that circuit SG is generated occurs to export variable a reference value.

Transistor 36 and light source 18 and break-and-make switch SW are connected in series, and inhibit the electricity for flowing through light source 18 based on a reference value Stream.

Resistance 38 is the source resistance for detecting the size of the electric current to circulate in light source 18.The source electrode side terminal of resistance 38 It is connect with the negative input terminal of amplifier 40.

The positive input terminal of amplifier 40 is connect with a reference source 42, and negative input terminal is connect with the source electrode of transistor 36.It puts Big device 40 amplifies the difference of a reference value and the current value detected by resistance 38, and the signal that amplification obtains is output to transistor 36 Grid.

Control circuit 44 carry out changed according to pattern of rows and columns of signal of communication a reference source 42 a reference value control, with from The variable a reference value of the output of a reference source 42.For example, control circuit 44 calculates the part duty cycle of signal of communication, calculating Said reference value is set as the first value when part duty cycle out is the first ratio, duty cycle is greater than upper in part Said reference value is set as the second value less than above-mentioned first value when stating the second ratio of the first ratio.At this point, control circuit 44 A reference value can also be changed in a manner of so that a reference value and the part duty cycle of signal of communication are inversely proportional." part is connected and is accounted for Empty ratio " be, for example, with during the connection during nearest disconnection and before during the disconnection altogether during it is opposite Ratio during the connection.Or " part duty cycle " can also use nearest n moving averages in signal of communication To replace.In this way, in the case that the size for the overshoot that the electric current to circulate in light source 18 generates depends on part duty cycle, It more can properly inhibit to overshoot.

As shown in Figure 1A, lighting device 10 can also have remote switch RS.Remote switch RS according to user's operation etc. come Send the dim signal LAS for adjusting the luminous intensity of light source 18.Dim signal LAS is for example by infrared communication, wireless The wireless communications such as LAN, Wi-Fi are sent to constant current generating device 12.Constant current generating device 12 can according to the dim signal come Change the current value of output.In addition, being also delivered to illuminating light communication device 16 by the dim signal that remote switch RS is generated.By This, the control circuit 44 of current suppressing circuit 17 can set a reference value corresponding with dim signal, illuminating light communication device 16 Control unit 19 be able to carry out aftermentioned break-and-make switch SW duty cycle control.

In addition, the dim signal LAS generated by remote switch RS can also be sent only to illuminating light communication device 16.By This, the control circuit 44 of current suppressing circuit 17 can set a reference value corresponding with dim signal LAS.In addition, illumination light is logical The control unit 19 of T unit 16 can be by carrying out the control of the duty cycle of aftermentioned break-and-make switch SW, come not only carry out can Light-exposed communication, also progress brightness adjustment control.Although the power consumption in current suppressing circuit 17 increases, directly benefit can be passed through Simultaneously with the constant current generating device and LED light source being equipped in the existing luminaire without optical communication capabilities and dimming function To its subsequent additional illuminating light communication device 16, to add optical communication capabilities and dimming function.

Then, B illustrates the illuminating light communication device 16B of variation referring to Fig.1.Figure 1B is indicated comprising dual-purpose control circuit The figure of the structural example of 50 illuminating light communication device 16B, the dual-purpose control circuit 50 make transistor be used for the modulation of illumination light Movement and the inhibition of the electric current to circulate in light source movement.In the structural example, transistor 36 also acts as above-mentioned break-and-make switch SW Function.

The illuminating light communication device 16B of Figure 1B has transistor 36 and dual-purpose control circuit 50.Dual-purpose control circuit 50 has Standby a reference source 42a, signal generating circuit SG, valve B1, valve B2, resistance 52, resistance 54, amplifier 56, resistance 58, resistance 60, electricity Container 62, amplifier 64, resistance 66, capacitor 68 and phase inverter 70.

The circuit part with signal generating circuit SG, valve B1, valve B2 and phase inverter 70 in dual-purpose control circuit 50 It is functioned as the modulation control circuit for making transistor 36 be modulated movement.

Signal generating circuit SG had been described above, therefore omitted.

Valve B1 for example can be the switch elements such as switching transistor, thyristor, according to the control for being input into control terminal Signal come be opened or closed, that is become it is non-conduction or conducting state.The control terminal input of valve B1 is come self-confident Number occur circuit SG signal of communication.

Valve B2 can be element identical with valve B1.The control terminal of valve B2 is inputted from signal generating circuit SG via anti- Phase device 70 carrys out the signal of communication after reverse phase.Valve B2 is big with the same electric current for flowing through light source in two input terminals of amplifier 56 The wiring of small corresponding negative input terminal and the level for being of virtually a reference value is (that is, the positive side cloth of a reference source 42a Line) connection.

Here, the action state of valve B1, valve B2, transistor 36 is illustrated using Fig. 1 C.Fig. 1 C is the figure for indicating truth table, The true value represents the action state of the signal of communication of the signal generating circuit SG in Figure 1B, valve B1, B2 and transistor 36. " SG " indicates the logical value (high level or low level) of signal of communication, and " B1 " indicates the state (connecting or disconnecting) of valve B1, " B2 " indicates the state (connecting or disconnecting) of valve B2, and " 36 " indicate the state (connecting or disconnecting) of transistor 36.It is communicating When signal is L (low level), valve B1, valve B2, transistor 36 are disconnection, on-off respectively, in light source 18 without flow through electric current from And extinguish.That is, valve B2 conducting when signal of communication indicates extinguishing, thus actually by two input terminals with The level of the corresponding negative input terminal of the size of above-mentioned electric current is set as the level of a reference value.Thus the output signal of amplifier 56 at For low level, transistor 36, which becomes, to be disconnected.

When signal of communication is H (high level), valve B1, valve B2, transistor 36 are to turn on respectively, disconnect, connect, in light source Electric current is flowed through to light.

Illumination light is adjusted according to switching on and off for corresponding with the signal of communication of two-value transistor 36 as a result, System.

In addition, in dual-purpose control circuit 50 other than signal generating circuit SG, valve B1, valve B2 and phase inverter 70 Circuit part is functioned as the current suppressing circuit of the electric current for inhibiting transistor 36 (that is, light source 18) middle circulation.

Resistance 52 is the size for detecting the electric current to circulate in the electric current to circulate in transistor 36, that is light source 18 Resistance.

Resistance 54 is to flow to ground line from a reference source 42a via resistance 54 and resistance 52 when valve B2 is connected for limiting The resistance of electric current.

Resistance 58 and resistance 60 are the circuits functioned as variable a reference source.That is, resistance 58 and resistance 60 detect The size of the voltage of dual-purpose control circuit 50 is applied to when valve B1 is connected.That is, the tie point of valve B1 and resistance 60 Voltage indicates the size for being applied to the voltage of dual-purpose control circuit 50, by via (here, 64 conduct of amplifier of amplifier 64 Buffer functions) positive input terminal of amplifier 56 is input to as a reference value.It is applied to the electricity of dual-purpose control circuit 50 Change at all according to the duty cycle of the signal of communication from signal generating circuit SG.In fig. ib, it is applied to dual-purpose control The voltage of circuit 50 processed is input to the positive input terminal of amplifier 56 as variable a reference value.According to the variable benchmark The current setting value for the upper limit for indicating to flow through the electric current of transistor 36 can be set as corresponding to a reference value and duty cycle by value Appropriate value.

A reference source 42a generates the constant voltage of a reference value or more.

Resistance 60 and capacitor 62 are functioned as filter, and amplifier 64 is played as the buffer of impedance matching Function.Resistance 66 and capacitor 68 are functioned as the filter of noise cutting off.

As described above, in the dual-purpose control circuit 50 of Figure 1B, (the SG L when above-mentioned signal of communication indicates extinguishing When), negative input terminal corresponding with the size for the electric current for flowing through light source 18 is actually set as by valve B2 (such as switching transistor) Thus transistor 36 is set as disconnecting by the level of a reference value.Dual-purpose control circuit 50 can be such that transistor 36 is modulated as a result, Movement, and the electric current for flowing through light source 18 can be suppressed to current setting value or less.

Then, illustrate the structure of dismountable illuminating light communication device 16.Fig. 2 is to indicate no fill light optic communication dress Set the circuit diagram of the structure of 16 lighting device 10A.That is, Fig. 2 indicates to delete illumination in the lighting device 10 of Figure 1A The structure of optical communication apparatus 16 and additional short-circuit line 11.Figure 1A indicates the lighting device 10 with visible light communication function, Fig. 2 table Show the lighting device 10A without visible light communication function.

Terminal T1, T2 and illuminating light communication device 16 or short-circuit line 11 in Figure 1A and Fig. 2 are connected.Terminal T1, T2 Can be terminal board or connector, can also by the wiring in existing lighting device by 11 phase of short-circuit line with Fig. 2 Position after corresponding wiring material cutting is set as terminal T1, T2.

According to structure as Figure 1A and Fig. 2, the existing luminaire without optical communication capabilities can be directly utilized The constant current generating device and LED light source of middle carrying simultaneously add optical communication capabilities by subsequent additional illuminating light communication device 16. About can additional this point subsequent in this way, illuminating light communication device 16B shown in Figure 1B is also same.

Then, the structure of control circuit 44 is described in more detail referring to Fig. 3~Fig. 6, which carries out basis The signal of signal of communication arranges to change the control of a reference value of a reference source 42.That is, being described as follows structural example：Control circuit 44 has Have n (integer that n is 2 or more) shift register that position data are kept while being shifted in signal of communication, is based on The n-bit data calculates the part duty cycle of signal of communication, determines base according to calculated part duty cycle Quasi- value.

Fig. 3 is the block diagram for indicating the structural example of control circuit 44 and signal generating circuit SG in Fig. 1.In the figure, it controls Circuit 44 processed has shift register 44a, operational part 44b, correction unit 44c, conversion portion 44d and reference value portion 44e.

Shift register 44a is by position n (n be 2 or more integer) in signal of communication caused by signal generating circuit SG Data are kept while being shifted.

The part that operational part 44b calculates signal of communication based on the n-bit data kept in shift register 44a, which is connected, to be accounted for Empty ratio.Part duty cycle for example can be (i) with (the continuous period of position 0) during nearest disconnection and immediately in the disconnection During connection before period (position 1 continuous during) altogether during ratio during the opposite connection.Alternatively, part Duty cycle can also be replaced with the moving average of the nearest position n in (ii) signal of communication, can also be in n Provide the moving average of digit.

Operational part 44b is in the case where finding out moving average as part duty cycle, as long as to shift LD The position n of device 44a merely finds out average.

Correction unit 44c is corrected to by the calculated part duty cycle of operational part 44b.Above-mentioned if (i) (ii) etc. calculation methods are different, then calculated result is also different, therefore is corrected by correction unit 44c.

Part duty cycle after correction is scaled corresponding appropriate a reference value by conversion portion 44d.That is, changing Calculation portion 44d determines appropriate a reference value according to the part duty cycle after correction.

Reference value portion 44e sets determined a reference value to a reference source 42.That is, reference value portion 44e A reference source 42, which exports determined a reference value, to be controlled such that a reference source 42.

Then illustrate the structural example of signal generating circuit SG.

In Fig. 3, signal generating circuit SG has judging part 44f, Opportunity awaiting control for linear portion 44g and driving portion 44h.

Signal of communication is inputted from control unit 19 to judging part 44f.The signal of communication both can repeatedly include lighting device 10 ID also may include from external information (such as merchandise news etc.).

Judging part 44f differentiates from whether the newest position that control unit 19 exports is " 1 ".Assuming that the position before newest position It is 0, then according to from the newest position that control unit 19 exports, generates rising edge in the current waveform of light source 18.Assuming that immediately in most Position before new position is 1, then continues the on state of light source 18 in the section of the newest position exported from control unit 19.

In the case where by judging part 44f, to be determined as newest position be " 1 ", Opportunity awaiting control for linear portion 44g makes based on the newest position The driving of break-and-make switch SW, the movement for that is exporting the newest position to the grid of break-and-make switch SW are standby extremely from control circuit Until 44 receive ready signal.It is to inhibit before the generation rising edge in the current waveform of light source 18 in electric current that this is standby The setting of a reference value corresponding with the part duty cycle before the rising edge is completed in circuit 17.

At the time of receiving ready signal from control circuit 44, driving portion 44h is exported to the grid of break-and-make switch SW The newest position " 1 " stated.

Moreover, it is judged that portion 44f can also replace differentiate from the newest position that control unit 19 exports whether be " 1 " mode, and Be differentiate from control unit 19 export newest two whether be " 01 ", that is discriminate whether newest position be 1 and immediately in Position before it is 0.In this way, judging part 44f is according to the current waveform for differentiating light source 18 from the newest position that control unit 19 exports In whether generate rising edge.

Then, the action example of control circuit 44 is described in more detail.

Fig. 4 is the flow chart for indicating the processing example of the control circuit 44 in Figure 1A.In Fig. 4, in lighting device 10 When visible light communication starts (such as when the starting of lighting device 10), control circuit 44 first carries out shift register 44a initial Change (such as reset) (step S10), and is initial value (step S12) by the reference value of a reference source 42.The initial value is for example It can be a reference value corresponding with the average duty cycle 75% of signal of communication.

When control unit 19 is input to shift register 44a for one of the signal of communication serially generated (step S14), Control circuit 44 differentiates whether inputted one is 1 (step S16).

In the case where being determined as inputted one is 1, control circuit 44 finds out the n that shift register 44a is kept The average value of position data is as part duty cycle (step S18).The average value is will the letter of the communication as serial data Number the position n in each circular treatment (step S14~S24) of Fig. 4 displacement come the moving average that finds out.Also, control electricity Road 44 is corrected (step S20) to moving average, finds out a reference value according to correction result and sets the base to a reference source 42 Quasi- value (step S22), and ready signal (step S24) is exported to signal generating circuit SG.By the output of the ready signal, One inputted in step S14 is output to the grid of break-and-make switch SW.In step S22, such as can be by referring to pre- The numerical tabular first stored finds out the electric current of current suppressing circuit 17 and sets to execute according to the value for the moving average being corrected The processing of definite value and a reference value.The numerical tabular for example can be the moving average after correction is corresponding with a reference value acquired Table.

Then, the structural example of shift register 44a is illustrated referring to Fig. 5.Fig. 5 is to indicate that the displacement in control circuit 44 is posted The explanatory diagram of the structural example of storage 44a.In Fig. 5, eight shift register 44a are instantiated.Shift register 44a has For inputting the serial input terminal of a data, the parallel output terminal for exporting eight bit data and for exporting one The Serial output terminal of data.In the eight bit data kept, from serial input terminal side in order be known as position b1, b2,···,b8.Position b1 is from the newest position that control unit 19 exports.B1 in place is being inputted from serial input terminal by newest position At the time of, to the grid input bit b2 of break-and-make switch SW.Position b1 is the step of Fig. 4 at the time of being output to the grid of break-and-make switch SW At the time of exporting ready signal in rapid S24.

Then, the concrete example of the correction in the step S20 of Fig. 4 is illustrated referring to Fig. 6.

Fig. 6 is the flow chart for indicating the correction example of step S20 of Fig. 4.When having found out moving average in step S18, As being judged to other in step s 16, the newest position b1 of shift register 44a is 1.In Fig. 6, control circuit 44 is as follows： Firstly, if the position b2 before newest position b1 is 0 (being in step s 30 "Yes"), to moving average multiplied by being Number k1 (step S32), further, if immediately the position b3 before b2 in place is 0 (being "Yes" in step S33), further It is secondary multiplied by coefficient k 1 (step S34).That is, control circuit 44 is as follows：At first from the end of shift register 44a B1 is continuous one the above are in the case where 0 after being 1 and second b2, and the coefficient k 1 less than 1 is added up to moving average Be multiplied number identical with continuous 0 digit.Here, coefficient k 1 for example can be 0.9.

On the other hand, in step s 30 for "No" in the case where, control circuit 44 is as follows：If position b3 is 1 (in step It is "Yes" in S36), then to moving average multiplied by coefficient k 2 (step S38), further, if position b4 is 1 (in step S40 In be "Yes"), then again multiplied by coefficient k 2 (step S42).That is, control circuit 44 is as follows：From shift register The end of 44a plays that first b1 is 1 and second b2 or third position b3 is later is continuous one the above are in the case where 1, The coefficient k 2 that will be greater than 1 adds up the number identical with the continuous digit for 1 after position b2 or b3 that is multiplied to moving average.This In, coefficient k 2 for example can be 1.03.

By this correction, the moving average in all data arrangements imagined can be made to converge on general 0.5~0.9 In the range of.An above-mentioned bearing calibration only example, needs to be selected according to required dynamic.Especially it is multiplied Coefficient changed according to data transmittal and routing form, power circuit condition used etc., therefore suitably set according to actual condition It is fixed.

By this structure, the electric current to circulate in light source 18 can more properly be inhibited to generate overshoot.

Fig. 7 is the explanatory diagram for indicating the modulation system of signal of communication.Fig. 7 indicates to modulate used in illuminating light communication device The example of aspect.The figure follows I-4PPM (the I-4Pulse Position of JEITA-CP1223 defined Modulation：4 value pulse position modulations) transmission mode.For example, the 4PPM signal of two bits " 00 " is by four time slot structures At a symbol during be modulated to " 1000 ".That is, there is pulse in a time slot in four time slots.? In visible light communication, ensures lighting time to light three time slots in four time slots, use the feelings of reverse phase 4PPM signal Condition is more.The signal of communication of the figure is the signal for being modulated to reverse phase 4PPM signal.In this case, the high level of signal of communication will Break-and-make switch SW, which is set as connecting, carrys out some bright light sources 18.In addition, break-and-make switch SW is set as disconnecting to put out by the low level of signal of communication Go out light source 18.For example, a time slot is 104.167usec (=1/9.6kHz), one is formed by four time slots (416usec) Symbol (symbol is two here).I-4PPM signal is made of the two-value of logical value 0,1, is one in four time slots The data arrangement of logical value 1 is established in a time slot.Signal of communication caused by signal generating circuit SG is by the logical value reverse phase Reverse phase 4PPM signal afterwards.Reverse phase 4PPM signal is used to modulate number by establishing negative pulse in which of four time slots According to if only seeing four time slots of a symbol, duty cycle is 75%.However, one will appreciate that if ignoring the separation of symbol, Then the mode of signal arrangement is there are many situations, and there is also many situations for part duty cycle.Fig. 8 shows its an examples.

Fig. 8 is example (a)~(d) figure for indicating signal of communication.In the data of four symbols of the figure, immediately in logical Letter signal from low level to high level rise before disconnection during with zero label is attached with during connecting.If observation is by zero mark Remember the partial data surrounded, then part duty cycle can for example be defined as breaking during nearest disconnection and immediately in this During connection before during opening altogether during ratio during the connection in (nearest a cycle).Fig. 8's In example (a), the frequency of nearest a cycle is 1.2kHz, and part duty cycle is 75%.It is in example (b) 4.8kHz, 50% are 3.2kHz, 66.7% in example (c), are 2.4kHz, 75% in example (d).Change in this way Position and the quantity for constituting the logical value 1 in the 4PPM signal of signal of communication, can change the duty cycle of break-and-make switch SW.

Then, illustrate that electric current corresponding with the part duty cycle of the signal of communication from signal generating circuit SG inhibits The optimal current settings of circuit 17.The constant current generating device 12 of premise as the lighting device 10 in present embodiment, such as There is constant current feedback function as it is stated that.As typical example, it can enumerate and as shown in Figure 1A use amplification The constant current feed circuit 26 of device.In general, being additionally implemented for ensuring the phase compensating circuit of the stability of feedback system.This phase is mended It repays in circuit using the compensation circuit comprising integral element to adjust one cycle transmission function (Japanese：One Xun Transfer Da Seki number) in Gain and phase, this phase compensating circuit as PI control or PID control well known to.In other words, this phase compensation Circuit can be described as the average value that will be exported control as fixed unit.Understanding based on this point, Fig. 9 indicate interrupted The explanatory diagram of the Utopian waveform of LED current.When observing the interrupted waveform of LED current shown in Fig. 9, utilize following formula (1) To indicate the average value Iave of the waveform.

Iave=Ip × d/100 (1)

Here, Ip is the peak value of LED current.D is to turn on duty ratio, is indicated with 100 × Ton/T (%).

Above-mentioned average value Iave by constant current feedback function be controlled as with discontinuously in the case where average current it is identical, And it is controlled as duty cycle changes as fixed value.That is, when duty cycle becomes smaller, peak I p become larger so that Iave is fixed value.If peak I p to be set as to the current setting value of current suppressing circuit 17, LED current waveform becomes square Shape wave obtains capable of eliminating the loss that overshoots and can also inhibit current suppressing circuit 17, so-called optimal current settings (referring to (2) formula).

Optimal current settings=Iave/d/100 (2)

Here, Iave is the LED average current in the case where not being subject to discontinuously.

Figure 10 is to be found out under conditions of the LED average current by not discontinuously is set as 240mA using (2) formula The figure of optimal current settings under each part duty cycle.As shown in Figure 10, optimal current settings with connection to account for Sky changes than the mode being inversely proportional.If set in this way according to the duty cycle of signal of communication by current suppressing circuit 17 Optimal current settings are then able to suppress the overshoot of LED current, and can be by illumination light when not being modulated to illumination light Brightness and the brightness of illumination light when being modulated to illumination light be set as almost equivalent in people.In addition, being accounted for will turn on In the case that sky is than being set as 75% (i.e. optimal current settings 320mA), can be confirmed according to simulation result can be effective Ground inhibits the overshoot of LED current and can reduce the power consumption in current suppressing circuit 17.

Then, referring to Fig.1 1A~14 illustrate present embodiment illuminating light communication device 16 control unit 19 in connection The control of duty ratio.Figure 11 A is to indicate to gradually change during the transfer set between direct current ignition mode and modulating mode The figure of the situation of duty cycle.

As shown in Figure 11 A, in light source 18 with direct current ignition mode come the B that lights during come with light source 18 with modulating mode During being set with transfer between during bright A.It is sent out during the transfer with the electric current for flowing through current suppressing circuit 17 (i.e. light source 18) During the curent change for changing quite.Here, direct current ignition mode refers to the state that break-and-make switch SW is set on hold to connection And light source 18 is set as to the ignition mode of illuminating state using the DC current provided from constant current generating device 12.Thus, it should The duty cycle d1 of break-and-make switch SW under direct current ignition mode is 100%.

In contrast, modulating mode refers to through signal of communication of the basis from signal generating circuit SG to break-and-make switch SW On-off control is carried out to be modulated to be superimposed the ignition mode of the information such as intrinsic ID to the illumination light of light source 18.It should The duty cycle d2 of modulating mode is for example set to 75% (referring to the example (d) of Fig. 8).

Electric current (the hereinafter referred to as LED current) to be circulated during as the B of direct current ignition mode in inner light source 18 is averaged Electric current Iave is, for example, 240mA and is fixed.In contrast, when being switched to conduct from during the B as direct current ignition mode When during the A of modulating mode, inhibit the overshoot of LED current by the function of above-mentioned current suppressing circuit 17, but due to Duty cycle d2 be set to it is smaller than the duty cycle d1 of direct current ignition mode Time, therefore can be according to above-mentioned (1) formula come such as The peak I p of LED current when calculating modulating mode down.

Ip=Iave/d=Iave/0.75=1.33 × Iave

In this way in modulating mode, the peak point current Ip to circulate in light source 18 become greater to 1.33 times.As concrete example, when straight LED current when flowing ignition mode is when being set as 240mA, peak point current Ip=about 319mA when modulating mode.This and following situation Matching：As shown in Figure 10, when duty cycle is 75%, the current setting value in current suppressing circuit 17 is set to 320mA.But as described above in the lighting device of present embodiment 10, LED average current Iave is controlled as example, about 240mA and be it is fixed, therefore the luminous intensity of the illumination light of light source 18 as described above with direct current ignition mode when it is almost the same.

When as described above from light source when being switched to during the B as direct current ignition mode as during the A of modulating mode The peak point current Ip to circulate in 18 becomes larger (such as becoming 1.33 times), therefore in the switching, human eye feels illumination color break-up sometimes It is bright.

Therefore, in order to inhibit the generation of this flashing, following control is executed in the lighting device 10 of present embodiment：? When the illuminating state of light source 18 switches between direct current ignition mode and modulating mode during setting transfer, during the transfer Gradually change the duty cycle of break-and-make switch SW.In more detail, in the illuminating state of light source 18 from direct current ignition mode When (during B) is switched to modulating mode (during A), control unit 19 gradually decreases to the duty cycle of break-and-make switch SW from d1 d2.In contrast to this, when the illuminating state of light source 18 is switched to direct current ignition mode (during B) from modulating mode (during A), Control unit 19 makes the duty cycle of break-and-make switch SW be gradually increased to d1 from d2.At this time, it is preferred that control unit 19 makes to connect Duty ratio is gradually reduced or is gradually increased with specified value Δ d (such as 5%) between d1 and d2.

Time span during transfer is for example preferably set to 0.5 second~several seconds or so.This is because when shorter than 0.5 Flashing inhibitory effect is deteriorated when the second, on the other hand for example generates when being longer than several seconds and needs extension inspection when manufacturing luminaire 14 The problem of looking into time etc.

By gradually changing the duty cycle of break-and-make switch SW during setting transfer as described above, it is able to suppress It is flashed when switching direct current ignition mode and modulating mode.

In addition, the case where alternately switching direct current ignition mode and modulating mode is instantiated in Figure 11 A, but it is unlimited Due to this, shape persistently can also be lighted based on modulating mode after being temporarily diverted to modulating mode from direct current ignition mode State.

Figure 11 B is to indicate to gradually change during the transfer set between the first modulating mode and the second modulating mode The figure of the situation of duty cycle.In Figure 11 B, duty cycle is during the first modulating mode of d2 is expressed as A, and connection accounts for Sky is than being during the second modulating mode of d1 is expressed as B.Here, duty cycle d1 is greater than duty cycle d2.

As shown in Figure 11 B, can also when being switched to the second modulating mode from the first modulating mode or switching on the contrary, During setting is shifted in-between and gradually change duty cycle.

In more detail, it when being switched to the second modulating mode (during B) from the first modulating mode (during A), is shifting During so that duty cycle is gradually increased to d1 from d2.In contrast to this, is being switched to from the second modulating mode (during B) It is interior during transfer that duty cycle is made to gradually decrease to d2 from d1 when one modulating mode (during A).But in the first modulation In mode and the second modulating mode, also including during transfer, the average current Iave for flowing through light source 18 is maintained fixed.

In the first different modulation mould of the duty cycle that exists while average current Iave is maintained fixed like this In the case where being switched between formula and the second modulating mode, by gradually changing duty cycle, it is able to suppress switching and adjusts It is flashed when molding formula.

Figure 12 is the feelings for indicating to gradually change duty cycle when lighting device 10 starts during the transfer set The figure of shape.In the lighting device 10 of present embodiment, it can also will start to adjust after starting constant current generating device 12 During setting transfer before molding formula (during B), it is gradually reduced the duty cycle of break-and-make switch SW during the transfer.

In more detail, as shown in figure 12, when putting into power supply to lighting device 10 and starting constant current generating device 12, LED current is gradually increasing during A, and at the time point that have passed through time t1 from being put into power supply, LED current reaches average electricity Flow Iave.The duty cycle of break-and-make switch SW during the A is set to d1 (such as 100%).Later, time t1 and when Between be set to transfer between t2 during, duty cycle gradually decreases to d2 (such as 75%) from d1 within this period.Then, exist After have passed through during transfer, duty cycle is set to d2, and the illuminating state of light source 18 becomes modulating mode (during B). After being transferred to modulating mode, LED current is also fixedly maintained average current Iave.

In the example shown in Figure 12, also can with above-mentioned Figure 11 A the case where in the same manner as time during setting transfer Length, duty cycle shift gears.In this way, by being set before it will start modulating mode after starting lighting device 10 So that the duty cycle of break-and-make switch SW is gradually decreased to d2 from d1 during fixed transfer and during the transfer, is able to suppress tune Molding formula flashes when starting.

In addition, the example in Figure 12, during illustrating to immediately begin to shift when LED current reaches average current Iave Son, but not limited to this, during starting transfer after LED current can also be waited to stabilize to average current Iave.

Figure 13 is to indicate to gradually change duty cycle during the transfer set when lighting device 10 drives and stops Situation figure.As shown in figure 13, it can also be set after stopping constant current generating device 12 and terminating modulating mode During fixed transfer, control unit 19 is interior during transfer to be gradually increased the duty cycle of break-and-make switch SW.

In more detail, in the illuminating state of modulating mode continue to the time point (during A) of time t3 and in time t3 In the case where the halt instruction for having input lighting device 10 (i.e. constant current generating device 12), set between time t3 and time t4 During transfer.In this case, control unit 19 can be by via wireless or wired be entered expression (not shown) switch etc. At the beginning of being set by the signal for carrying out opening operation during shifting (time t3).The break-and-make switch SW during transfer Duty cycle be gradually increased to d1 (such as 100%) from d2 (such as 75%).During the transfer, LED current is with flat Equal electric current Iave is kept fixed.Then, after during it have passed through transfer, duty cycle is fixed to d1, in this state LED current decline, becomes zero (i.e. OFF state) soon.

In the example shown in Figure 13, can with above-mentioned Figure 11 A the case where in the same manner as time during setting transfer it is long The variation pattern of degree, duty cycle.In this way, by immediately in make constant current generating device 12 stop and make modulating mode (the A phase Between) terminate after set transfer during and control unit 19 make during the transfer switch duty cycle be gradually increased, energy Enough inhibit to flash at the end of modulating mode.

In addition, illustrating among the above and inputting the example during stop signal simultaneously starts transfer to lighting device 10 Son, but not limited to this.For example, the case where control unit 19 is unable to get the stop signal of the opening operation based on switch etc. Under, it can use current sensor (not shown) also to detect LED current, start to decline from average current Iave in LED current When start transfer during.

Figure 14 A is turn for indicating to set between the luminous intensity of light source different the first dimming state and the second dimming state The figure of the situation of duty cycle is gradually changed during shifting.As shown in Figure 14 A, it is also possible to circulate in light source 18 When being switched between mutually different first light-modulating mode (during A) of average current Iave and the second light-modulating mode (during B) During setting transfer.Moreover, control unit 19 during transfer in be gradually increased the duty cycle of break-and-make switch SW temporarily after It is gradually reduced.

In more detail, LED is adjusted before the time point of time t5 with first under the modulating mode of average current Iave1 Light state (during A) carrys out some light yellows.Then, next when being received in time t5 constant current generating device 12 and illuminating light communication device 16 When from the dim signal LAS of remote switch RS (referring to Fig.1), during the setting transfer of control unit 19.During the transfer, control unit 19 make the duty cycle of break-and-make switch SW temporarily be gradually increased to d1 (such as 100%) later from d1 from d2 (such as 75%) Gradually decrease to d3 (such as 66.7%).In addition, by the output for changing constant current generating device 12 during the transfer, LED Average current gradually decreases to Iave2 from Iave1.Then, in a period of from time t6 to time t7, with LED average current Iave2 come be continuously turned on duty ratio be d3 modulating mode under the second dimming state.

Later, when time t7 is received from the dim signal LAS of remote switch RS (referring to Fig.1), control unit 19 After making duty cycle temporarily be gradually increased to d1 from d3, d2 is gradually decreased to from d1.Then, after time t8, It is continuously turned on duty ratio with LED average current Iave1 as the second dimming state under the modulating mode of d2.

In this way, passing through different the first dimming state (during A) of the luminous intensity in light source 18 and the second dimming state (B phase Between) between be gradually increased duty cycle temporarily during the transfer that sets after be gradually reduced, be able to suppress switch light modulation It is flashed when state.

Figure 14 B is indicated in Figure 14 A in the connection duty of the first dimming state and the second dimming state modulated mode Than the figure of identical situation.In Figure 14 A, the disconnected of the first dimming state (during A) and the second dimming state (during B) is instantiated The different situation of the duty cycle of continuous switch SW, but not limited to this.As shown in Figure 14B, the connection of the first dimming state Duty ratio d2 can also be identical (such as 75%) with the duty cycle d3 of the second dimming state.Thus it can also play identical Function and effect.

In addition, illuminating light communication device, luminaire involved in the disclosure and lighting device be not limited to it is above-mentioned Embodiment and its variation can make various changes within the scope of item documented by following claims, change Good, this is self-evident.

Claims (11)

1. a kind of illuminating light communication device is connect with the light source by issuing illumination light from constant current generating device circulating current, And the illumination light of the light source is modulated, which is characterized in that having：

Switch is connected in series with the light source；

Signal generating circuit generates the signal of communication for controlling the two-value of the switch switched on and off, to described Illumination light is modulated；

Current suppressing circuit is connected in series with the light source and the switch, the electric current for flowing through the light source is suppressed to not More than current setting value corresponding with a reference value；And

Control unit can change the duty cycle of the switch by the signal of communication,

Wherein, described in changing during the electric current that the control unit circulates in the current suppressing circuit changed transfer The duty cycle of switch.

2. illuminating light communication device according to claim 1, which is characterized in that

Has dual-purpose control circuit, which is used for the function of the signal generating circuit and the electric current inhibits The function of circuit.

3. illuminating light communication device according to claim 1, which is characterized in that

The current suppressing circuit inhibits the electric current to circulate in the light source by controlling the switch.

4. illuminating light communication device described according to claim 1~any one of 3, which is characterized in that

It is fixed but mutually different first modulating mode of the duty cycle and second in the average current for flowing through the light source During setting the transfer when switching between modulating mode, the control unit changes connecing for the switch during transfer Logical duty ratio.

5. illuminating light communication device described according to claim 1~any one of 4, which is characterized in that

During setting the transfer when the illuminating state of the light source lights pattern switching to modulating mode from direct current, the control Portion processed reduces the duty cycle of the switch during transfer.

6. illuminating light communication device described according to claim 1~any one of 5, which is characterized in that

During setting the transfer when the illuminating state of the light source is switched to direct current ignition mode from modulating mode, the control Portion processed increases the duty cycle of the switch during transfer.

7. illuminating light communication device described according to claim 1~any one of 6, which is characterized in that

During setting the transfer before will starting the modulating mode after starting the constant current generating device, the control Portion processed reduces the duty cycle of the switch during transfer.

8. illuminating light communication device described according to claim 1~any one of 7, which is characterized in that

Immediately in stop the constant current generating device and make the modulating mode terminate after set the transfer during, it is described Control unit increases the duty cycle of the switch during transfer.

9. illuminating light communication device described according to claim 1~any one of 8, which is characterized in that

It is set when switching between mutually different first dimming state of average current for flowing through the light source and the second dimming state During the fixed transfer, the control unit subtracts after increasing the duty cycle of the switch temporarily It is small.

10. a kind of luminaire, have according to claim 1~any one of 9 described in illuminating light communication device and institute State light source.

11. a kind of lighting device has luminaire according to claim 10 and the constant current generating device.